Yahoo Inc co-founder Jerry Yang has quit the Internet company he started in 1995, appeasing shareholders who had blasted the Internet pioneer for pursuing an ineffective personal vision and impeding investment deals that may have transformed the struggling company.

Republican Mitt Romney acknowledged Tuesday that his income tax rate is “probably closer to 15 percent than anything,” suggesting that one of the wealthiest people to ever run for U.S. president pays a much lower rate than most Americans.

The Republican presidential hopefuls attacked front-runner Mitt Romney’s business record and his failure to release his tax returns on Monday, looking to halt his growing momentum during the early stages of a debate in South Carolina.

The leader of the Pakistani Taliban, the militant movement that poses the gravest security threat to the country, is believed to have been killed by a U.S. drone strike, four Pakistan intelligence officials told Reuters on Sunday.